Steam-turbine.



H0 MODEL.

mmmm mmmnmmnm Inventor Httornley.

Witnesses Zea 4% 1mm lutions.

UNITED STATES Patented September 29, 1903.

"PATENT OFFICE.

STEAM- TU RBIN E.

SPECIFICATION forming part of Letters Patent No. 740,332, dated September 29, 1903.

Application filed April 3, 1903. Serial 1%. 150846. (No model.)

To aZZ whom it may concern:

Be it known that I, J OHANN STUMPF, a subject of the German Emperor, residing at 27 Rankestrasse,-Berlin,Germany,have invented certain new and useful Improvements in and Relating to Steam-Turbines, of which the following is a specification.

In many power plantsas, for example, in'

marine engines, pumping-machines, and-the like-an alteration in the number of revolutions is frequently required. If a steam-turblue is employed as the inotor,considerable inconvenience results from the alteration of the number of revolutions, as the steam-ad mission nozzles are arranged for an absolutely certain number of revolutions as to their angular position in reference. to the turbinewheel. When the turbine-wheelie required to alter the number of these revolutions, very considerable losses of power result through slip, as the angle of the admission-nozzles is unfavorable for a different number of revothe velocity of the steam, the velocity of the circumference of the wheel, and the angle of the steam-admission nozzles-that is to say, the angle of the inlet in reference to the blades of the turbine-wheel. These proportions are exactly determined by the diagram of velocity. The losses thus resulting'by slip may be avoided by the present invention in such manner that for the turbine-wheel different steam-admissionarrangements are pronozzles for two or three velocities and toem ploy for the single sets of nozzles different steam-chambers. cases in which the various sets of nozzles required might be arranged in difierentcircles. A simple arrangement in which the invention iscarriedintoeftectisillustratedinFigure 1, which is a section of a Laval turbine-wheel.

The circumference of the wheel, as well as There is a certain relation between Moreover, there might be.

sented as developed. I

In the example illustrated in Fig. 1 provision is made for three grades of velocity. At the side of the wheel-rim a the nozzles or orifices are arranged, which are determined in series b b b for different numbers of revolutions. Each series of nozzles or orifices receives the steam from a chamberc', 0 or 0 each of which is provided with a special steaminlet'socket, such as (1, 61 or d The proportions of the respective series may be observed from the diagram of velocities which are indicated in Figs. 2 to 4. In each case a plate a is indicated, at the side'of which a corresponding nozzle b is illustrated. The absolute inlet velocity is throughout W=98O m. The circumferential velocity is, as illustrated in the diagrams of Figs. 2 to 4, V :35O 1n.,

250 111., and V 175 m. The relative inlet velocities result C :675 m., C :75O m., and (3:830 m. The different angles of the nozzles or orifices are twenty-four, twentyeight, and thirty degrees, respectively.

The proportions herein before stated correspond to'a running of three thousand, two thousand two hundred, and one thousand five hundred revolutions per minute.

The examples given refer to considerable diiierences in the number of revolutions, in which the losses through slip would be correspondingly great. For more approximate numbers of revolutions the provision of dif fereut inlet-nozzle angles might be dispensed with, but difierent inlet-angles may be arranged even if there is only a question of a little dilference in the number of revolutions.

The invention is of course applicable to gas-turbines. It is also applicable to turbines in which guide-blades are employed to guide 'the steam-admission arrangement, is repre ICO said sets of orifices being at different angles different angles to the plane of rotation of to the plane of rotation of the wheel, snbstanthe wheel, and respective fluid-chambers for tially as described.- said orifices, substantially as described.

2. In steam turbines, a turbine-wheel, a In testimony whereof I have signed .my :5 5 plurality of fluid-admission orifices, said oriname to this specification in the presence of fices being at different angles to the plane of two subscribing witnesses.

rotation of the Wheel "substantially as de-- scribed. JOHANN STUMPF.

3. In a steam-turbine, a turbine-Wheel, a Witnesses: :o plurality of fluid-admission orifices for said WOLDEMAR I-IAUPT, wheel, said fluid-admission orifices, being at HENRY HASPER. 

